Image forming device and sheet transport device

Details Image forming device and sheet transport device Image forming device and sheet transport device

2007-06-26

2007-06-26

Mackey, Patrick (Department: 3653)

Sheet feeding or delivering

Feeding

Separators

C271S125000, C271S258010, C271S262000

Reexamination Certificate

active

10682295

ABSTRACT:
This sheet multifeed determination device is capable of accurately detecting a sheet multifeed state, and the sheet multifeed determination device includes: a separating member side sheet speed detecting part which detects a transport speed of a sheet surface on the separating member side of a sheet transported to a nip unit of a paper feed roll and a separating member pressure-contacting mutually; a multifeed sheet detecting part which detects presence of plural sheets in the course of being transported through the nip unit; and a multifeed state determination part which determines not to be in a multifeed state of sheets when the sheet speed detected by the separating member side sheet speed detecting part is V2≦0 and determines to be in the multifeed state of sheets in the case of V2>0 in a condition where the multifeed sheet detecting part detects multifed sheets.

REFERENCES:
patent: 5172900 (1992-12-01), Uno et al.
patent: 6231041 (2001-05-01), Jacques
patent: 5-32356 (1993-02-01), None
patent: 6-72580 (1994-03-01), None
patent: 8-198478 (1996-08-01), None
patent: 9-150990 (1997-06-01), None
patent: 10-45272 (1998-02-01), None
patent: 11-301885 (1999-11-01), None
patent: 2000-95390 (2000-04-01), None

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